Centrifugal pump



Dec. 29, 1931. O JACOBSEN 1,839,032

' CENTRIFUGAL PUMP Filed Jan. 21. 1951 2 Sheets-Sheet 1 2 1 10 INVENTORDec. 29, 1931. o. JACOBSEN CENTRIFUGAL PUMP Filed Jan. 21, 1931' 2SheetsSheet 2 Patented Dec. 29, 1931 UNITED STATES PATENT OFFICE OYSTEINJACOBSEN, OF DAYTON, OHIO, ASSIGNOR TO THE DURIRON COMPANY, INC., A

CORPORATION OF NEW YORK CENTRIFUGAL PUMP Application filed January 21,1931. Serial No. 510,102.

separator in the line of the return flow to the pump. One embodiment ofthe invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a plan view of the pump. Fig.

2 is a side elevation partly in section on the line II-II of Fig. 1.Fig. 3 is another plan view partly in section. And Fig. 4 is an endelevation partly in section on the line IV IV of Figs. 1 and 3 and witha part of the oasin broken away at the center of the pump.

5 Tteferring to the drawings, 1 and 2 are parts of the pump casingbolted together;

3 is the drive shaft provided at one end with the impeller or runner 4and at the other end with the pulley 5; and. 6 is a suction elbow havingat-its upper end a priming opening provided with a suitable cover 7. Theelbow carries a strainer 8 of cup-shaped supported on suitable lugs 9andremovable through the priming openlng when the cover is removed.

Leading horizontally from the upper periphery of the volute 10 isa-discharge outlet 11 leading into the separation chamber 12. The casingof this chamber is secured against the casing section 1 by means of thebolts 13, suitable gaskets being provided at 14 and 15. The chamber 12.is provided with a discharge outlet 16 located above the outlet 11 andpreferably at ah angle of 90 degrees thereto. The chamber is providedwith a removable cover 17 which permits of the insertion and removal ofthe cup shaped strainer 18, such strainer being supported on the lugs19.

The lower end of the chamber 12 communicates with a priming conduit 20which extends across the suction elbow 6 with its end 21 turnedlaterally in alignment with the axis of rotation of the runner andopposition to the eye 22 of the pump (Fig. 2) which is in the form of ashort tube with inwardly taperin walls.

I lZVhen the pump is primed, the liquid lies at about the level A,filling the elbow and most of the volute. The pump is then started, andthe action of the runner withdraws the liquid in the elbow and forces itthrough the horizontal outlet passage 11 into the chamber 12. It thenflows by gravity through the conduit 20 and is discharged through theeye of the pump. This circulation carries with it some of the air in theelbow 6, and as this circulating action is continued, the air becomesexhausted from the elbow and the suction pipe connected thereto, causingthe parts to fill with water. When this occurs, the chamber 12 iscompletely filled with water under pressure, so that a discharge occursthrough the outlet 16. The screen 18 assists in protecting the pump fromthe continued circulation therethrough of any coarse material which mayhave gotten past the screen 8 in the suction elbow. The provision of thetapering inlet tube 22 at the eye of the pump increases the drag imposedon the water and air in the elbow 6 incident to the injection action ofthe liquid flowing through the end 21 of the priming conduit, anddecreases the time required to free the suction elbow and its supplypipe from air. The use of the vertical separation chamber 12 with itsremovable cover ermits the use of the strainer 18, thus involvmg asubstantial degree of protection from the circulation ofcoarse materialand increases the life of the impeller and interior surface of the pumpcasing. The horizontal discharge. outlet with the vertical separationchamber at the side of the pump permits the use of a simpler form ofconstruction and reduces the overhead required as compared withconstructions having the separation chamber on top of the pump casing.Other advantages of the construction will be apparent to those skilledin the art.

What I claim is:

1. In combination in a centrifugal pump, a casing having an inlet eye atits center and a volute around its periphery, a discharge outletextending horizontally'from the upper portion of the periphery of thevolute, a vertical separation chamber into which the outlet dischargesintermediate the ends of such chamber and itself having a dischargeoutlet located above the first discharge outlet, a runner or impellermounted for rotation in the casing with its axis of rotation in linewith the inlet eye, a suction elbow with an enlarged end cavity inopposition to and surrounding the inlet eye, and a priming conduitleading from the lower end of said separation chamber into saidelbowwith its end turned laterally in alignment with the axis of rotation ofthe runner and in opposition to said eye.

2. In combination in a centrifugal pump, a casing having an inlet eye atits center and avolute around its periphery, a discharge outletextending horizontally from the upper portion of the periphery of thevolute, a'vertical elongated separation chamber into which dischargeleads intermediate its ends and having a discharge located above thefirst discharge, a removable top for said chamber, acup-shapedscreening! member seated removably in said chamber below said firstinlet, a suction elbow with an enlarged end cavity in opposition to andsurrounding the inlet eye, and a priming conduit leading from saidseparation chamber into said elbow with its end in alignment with theaxis of rotation of the runner'and in opposition to said eye.

In testimony whereof, I have hereunto s'ubscribed my name this 19th dayof J anuary,

O. J ACOBSEN.

